Final answer:
Plants and animals grow through cell division and enlargement, utilizing existing nutrients and energy sources within the system. \
Step-by-step explanation:
Plants and animals grow through cell division and enlargement, utilizing existing nutrients and energy sources within the system. Plants use energy from sunlight to make sugar and other organic molecules through photosynthesis, while animals obtain their nutrients by consuming other organisms.
In plants, growth occurs through cell mitosis, while animals grow by consuming food and converting it into energy. The growth of plants and animals is primarily driven by genetic factors, and new matter is added through metabolic processes.